Comparaison build LLVM 8 build different way
Xcode 10.1 Mojave


Xcode 10: 

	Processor: Intel Core i7 @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.13.6, Kernel: 17.7.0 (x86_64), Display Server: X Server 1.18.4, OpenGL: 2.1, Compiler: Clang 7.0.1 + GCC 4.2.1 + LLVM 7.0.1 + Xcode 10.1, File-System: MS-DOS FAT16, Screen Resolution: 2880x1800

GCC 8.2.0: 

	Processor: Intel Core i7 @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.13.6, Kernel: 17.7.0 (x86_64), Display Server: X Server 1.18.4, OpenGL: 2.1, Compiler: Clang 7.0.1 + GCC 4.2.1 + LLVM 7.0.1 + Xcode 10.1, File-System: MS-DOS FAT16, Screen Resolution: 2880x1800

LLVM 7.0.1: 

	Processor: Intel Core i7 @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.13.6, Kernel: 17.7.0 (x86_64), Display Server: X Server 1.18.4, OpenGL: 2.1, Compiler: Clang 7.0.1 + GCC 4.2.1 + LLVM 7.0.1 + Xcode 10.1, File-System: MS-DOS FAT16, Screen Resolution: 2880x1800

LLVM 8 Build with LLVM 7: 

	Processor: Intel Core i7 @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.13.6, Kernel: 17.7.0 (x86_64), Display Server: X Server 1.18.4, OpenGL: 2.1, Compiler: Clang 7.0.1 + GCC 4.2.1 + LLVM 7.0.1 + Xcode 10.1, File-System: MS-DOS FAT16, Screen Resolution: 2880x1800

LLVM 8 Build with Xcode 10: 

	Processor: Intel Core i7 @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.13.6, Kernel: 17.7.0 (x86_64), Display Server: X Server 1.18.4, OpenGL: 2.1, Compiler: Clang 7.0.1 + GCC 4.2.1 + LLVM 7.0.1 + Xcode 10.1, File-System: MS-DOS FAT16, Screen Resolution: 2880x1800

Xcode 10.1 Mojave: 

	Processor: Intel Core i7 @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.14.4, Kernel: 18.5.0 (x86_64), Display Server: X Server 1.18.4, OpenGL: 2.1, Compiler: Apple LLVM 10.0.1 (clang-1001.0.46.4) + GCC 4.2.1 + Xcode 10.2.1, File-System: APFS, Screen Resolution: 2880x1800


C-Ray 1.1
Total Time - 4K, 16 Rays Per Pixel
Seconds < Lower Is Better
Xcode 10 .......... 368 |======================================================
GCC 8.2.0 ......... 304 |============================================
Xcode 10.1 Mojave . 370 |======================================================


Timed PHP Compilation 7.1.9
Time To Compile
Seconds < Lower Is Better
Xcode 10 ................... 171 |============================
GCC 8.2.0 .................. 209 |==================================
LLVM 7.0.1 ................. 244 |========================================
LLVM 8 Build with LLVM 7 ... 274 |=============================================
LLVM 8 Build with Xcode 10 . 267 |============================================


Timed ImageMagick Compilation 6.9.0
Time To Compile
Seconds < Lower Is Better
Xcode 10 ................... 73.44  |=======================
GCC 8.2.0 .................. 131.83 |==========================================
LLVM 7.0.1 ................. 107.16 |==================================
LLVM 8 Build with LLVM 7 ... 131.37 |==========================================
LLVM 8 Build with Xcode 10 . 125.89 |========================================
Xcode 10.1 Mojave .......... 80.24  |==========================


7-Zip Compression 16.02
Compress Speed Test
MIPS > Higher Is Better
Xcode 10 .......... 19036 |====================================================
GCC 8.2.0 ......... 18212 |==================================================
Xcode 10.1 Mojave . 17626 |================================================


GraphicsMagick 1.3.30
Operation: Sharpen
Iterations Per Minute > Higher Is Better
Xcode 10 ................... 47  |===================
GCC 8.2.0 .................. 110 |=============================================
LLVM 7.0.1 ................. 47  |===================
LLVM 8 Build with LLVM 7 ... 47  |===================
LLVM 8 Build with Xcode 10 . 47  |===================
Xcode 10.1 Mojave .......... 45  |==================


GraphicsMagick 1.3.30
Operation: HWB Color Space
Iterations Per Minute > Higher Is Better
Xcode 10 ................... 129 |================================
GCC 8.2.0 .................. 184 |=============================================
LLVM 7.0.1 ................. 130 |================================
LLVM 8 Build with LLVM 7 ... 131 |================================
LLVM 8 Build with Xcode 10 . 131 |================================
Xcode 10.1 Mojave .......... 124 |==============================


GraphicsMagick 1.3.30
Operation: Resizing
Iterations Per Minute > Higher Is Better
Xcode 10 ................... 96  |===========================
GCC 8.2.0 .................. 163 |=============================================
LLVM 7.0.1 ................. 96  |===========================
LLVM 8 Build with LLVM 7 ... 99  |===========================
LLVM 8 Build with Xcode 10 . 99  |===========================
Xcode 10.1 Mojave .......... 92  |=========================


Timed Apache Compilation 2.4.7
Time To Compile
Seconds < Lower Is Better
Xcode 10 ................... 48.55 |==================================
LLVM 8 Build with Xcode 10 . 60.60 |===========================================
Xcode 10.1 Mojave .......... 48.22 |==================================